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<h4 class="subsection" id="ARM-C-Language-Extensions-_0028ACLE_0029-1"><span>6.60.7 ARM C Language Extensions (ACLE)<a class="copiable-link" href="#ARM-C-Language-Extensions-_0028ACLE_0029-1"> &para;</a></span></h4>

<p>GCC implements extensions for C as described in the ARM C Language
Extensions (ACLE) specification, which can be found at
<a class="uref" href="https://developer.arm.com/documentation/ihi0053/latest/">https://developer.arm.com/documentation/ihi0053/latest/</a>.
</p>
<p>As a part of ACLE, GCC implements extensions for Advanced SIMD as described in
the ARM C Language Extensions Specification.  The complete list of Advanced SIMD
intrinsics can be found at
<a class="uref" href="https://developer.arm.com/documentation/ihi0073/latest/">https://developer.arm.com/documentation/ihi0073/latest/</a>.
The built-in intrinsics for the Advanced SIMD extension are available when
NEON is enabled.
</p>
<p>Currently, ARM and AArch64 back ends do not support ACLE 2.0 fully.  Both
back ends support CRC32 intrinsics and the ARM back end supports the
Coprocessor intrinsics, all from <samp class="file">arm_acle.h</samp>.  The ARM back end&rsquo;s 16-bit
floating-point Advanced SIMD intrinsics currently comply to ACLE v1.1.
AArch64&rsquo;s back end does not have support for 16-bit floating point Advanced SIMD
intrinsics yet.
</p>
<p>See <a class="ref" href="ARM-Options.html">ARM Options</a> and <a class="ref" href="AArch64-Options.html">AArch64 Options</a> for more information on the
availability of extensions.
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